Move NestedServletExceptionTests to spring-web module

See gh-25162

spring-web/src/test/java/org/springframework/web/util/NestedServletExceptionTests.java

@@ -0,0 +1,48 @@
+/*
+ * Copyright 2002-2022 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.web.util;
+
+import org.junit.jupiter.api.Test;
+
+import org.springframework.core.NestedExceptionUtils;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+public class NestedServletExceptionTests {
+
+	@Test
+	public void testNestedServletExceptionString() {
+		NestedServletException exception = new NestedServletException("foo");
+		assertThat(exception.getMessage()).isEqualTo("foo");
+	}
+
+	@Test
+	public void testNestedServletExceptionStringThrowable() {
+		Throwable cause = new RuntimeException();
+		NestedServletException exception = new NestedServletException("foo", cause);
+		assertThat(exception.getMessage()).isEqualTo(NestedExceptionUtils.buildMessage("foo", cause));
+		assertThat(exception.getCause()).isEqualTo(cause);
+	}
+
+	@Test
+	public void testNestedServletExceptionStringNullThrowable() {
+		// This can happen if someone is sloppy with Throwable causes...
+		NestedServletException exception = new NestedServletException("foo", null);
+		assertThat(exception.getMessage()).isEqualTo("foo");
+	}
+
+}